You can manage your tooltips by updaing Advanced settings.
Portal Tooltip
Allows you to show the Tooltip on any page within the Portal.
Note: Portal Tooltips must be enabled by a Superuser/Host. Refer to Install Guide to enable/disable Portal Tooltips
Attached To
Contains the list of the elements to attach the tooltip to.
New Attach To
Allows you to specify the jQuery Selector to attach the tooltip to.
Example 1: You want to attach the tooltip to a link with id="DNNRegisterLink"
You would add "New Attach To" with Selector: #DNNRegisterLink
Example 2: You want to attach the tooltip to a textbox with name="dnn$firstname"
You would add "New Attach To" with Selector: [name=dnn$firstname]
Note: You may use any valid jQuery selector to attach the tooltip. Refer to jQuery Reference for details.